That Arai with the flames, Team Hammer, original Schwantz, Bell Lawson, Arai Yoshimura. . . a lot of the Suomys.
Some of McGrath's first TLD Bells were cool. Along with Henry's Thumper lid. Lots of old one off MX stuff here...http://www.vitalmx.com/forums/Moto-Related,20/Cool-Custom-Helmets-of-the-stars,1225233 I'm always partial to CE's stuff.
Gotta admit that I really liked Danny's TOBC helmet. But then again the TOBC graphics are as classy as they get IMHO.
I have two or three of the black/grey ones in my garage. My favorite helmet for sure. I would say the Rossi chicken helmet is my other favorite.